Electric accumulator



June 13, 1933. p WOLF 7 1,913,908

ELECTRIC ACCUMULATOR Filed'April 28, 1930 [2 Wolf Patented June 13, 1933 g i r i UNITED STATES PAT NT O C Application filed April as, 1930.ser a1'1vo.44s,cea

This invention relates to accumulators, '12. The cells are closed by thecover 2 supmore particularly for operating miners ported on a rubberringlO, which is pressed lamps, and to comparatively easily portable onas is described below. The pieces-6 and accumulators of elongatedrectangular crossare fixed (welded, soldered) to'the vessel section,which are used for supplying current 1 and have slots at their-upperends. 1 The to head lamps (incandescent lamps carried on pieces 15 areextended at the lower ends and the cap of the miner). The object of theinare so shaped that a belt for carrying the vention is ingeneral toincrease safety in opvessel may be passed through. The pins 27 erationand avoid danger from {fire damp. attached to the frame-like levers 3are pushed 7175 age of the electrolyte. In accumulators of "lar'lymovable;

10 For such accumulators an absolutely tight into the above mentionedslots of the pieces and reliable closing of the accumulator vessel 6 and15, so that the levers may be moved is of particular importance, becausethe conabout these pins as fulcrums. The two levers ductors and fittingson the cover of the acare connected together at the middle of thecumulator vessel would be damaged by a leakvessel by a bridge "member 29so as to be angu- [The bridgemember 29'conelongated-fiat shape, leaksmay easily occur if tains the screw thread for the pressure screw thecover, in the shape of a long narrow rec-' '28, which presses on thepressure 'piece'3'O tangle, is not everywhere strongly and uniwhichcovers almost the whole width of'the formly pressed on. Such a uniformpressing accumulator. By turning the screw the v I 20 on is madepossible by the lever arrangement bridge member 29 and with it'the'inner' arms 'tolbe described, in which also provision is "of thelevers 3 may be lifted, Theouter made for the quickest and mostconvenient lever armsthen lie against the cover 2 and manipulation ofthe closing coverk exercise a pressure on this simultaneously It isknown to provide two-armed closing with'the part 30. It is thuspossibleto exer- I25 levers which are adapted to move about a cise apressure at the middle of thejcover2,

a pivot mounted on-the cover and which are and at the same time onitsendsbymeans operated by means of a screw, which is arof this singlescrew 28, whereby thepressure ranged in the mlddle of the cover andengages is well distributed by. the broad-pressure a bridge memberconnecting the ends of'the piece 30 and the cross pieces/of the frame'30 levers. These systems are however not ap- 3. To open the accumulatorvessel, it is only plicable for elongated covers and especiallynecessary to loosenthe screw 28 and to-slide for such covers which aremade of hard rubthe lever 3, now lying loose, with its pins her or thelike because they exert tension and 27 to the left out of the slots ofthe pieces'fi pressure on the cover and also actually cause and 15. Theclosing parts 3,- 29, 30,28 form 435 a deformation of the cover if thelatter does a joint system novabl'e Within itself." 7

not consist of resistible material. The parts 12 nearest to the narrowside of Figure 1 of the accompanyin drawing ilthe vessel which arepressed or cast into the lustrates such an accumulator, eing an elecover2 consisting of insulating material, vation of the narrow side, with apartial form at the top contact blades which lie'becross section. tweenthe contact springs 20 and 22 onthe Figure 2 is a front elevation, witha partial outer cover 4. Further, bushes ll-are fixed, section throughthe accumulator vessel and to the cover 2 which form the apertures forcover, so that the inner parts and arrangefilling'th'e cellswithelectrolyte. The stopments are visible. pers' screwed into these bushesand tightly 1 Figure 3'is a plan View of the accumulator, closed withrubber rings are formed as-dipthe outer cover 4 with the parts attachedping contacts for-testing the height ofthe thereto beingremoved.electrolyte, andar'e reached by the electrolyte The elongatedrectangular vessel 1 contains when a s'uflicient-quantity of it is'present; "At 7 two cells 33 with pairs of eleetrodes14 -14the'uppe'ren'ds the stoppers13areelongated 50 which are attached to thecover 2 by holders so that they reach through openings in'the arms ofthe levers outer cover 4:. It can thus be ascertained, whether theelectrolyte in a cell stands at a sufficient height, by applying acurrent circuit consisting of an accumulator 31 and lamp 32 to thedipping conductor and to the outer wall of the accumulator vessel, inthe manner shown in Figure 2, when the lamp 32 should light up, if theliquid level is correct. It is, however, impossible for unauthorizedpersons to remove the stoppers 13, as they are cut away at their upperends, and are held fast in the rubber rings 17, 18 fitted in theapertures of the cover 4. On the other hand the cover 4 cannot be fittedon and closed if the stoppers 13 are not properly screwed in. T ecompletely removable cover 4: is so formed that it overlaps the edge ofthe accumulator vessel 1 on all four sides. It thereby engages, with itsstrengthened hook-like extension 4a (Figure 2, left), the protrudingedge of the vessel, while on the opposite side (Figure 2, right) it issecured by the hasp of the flap 8 which is rotatable in the joint 7, andwhose nose 8a enters a hole in the cover. The nose 8a is secured to thecover by a latch 9 under spring pressure, which can only be released bymeans of a strong magnet. The rings 17 18 in the cover 4 thus serve forvarious purposes. They prevent the closing of the cover 4 when thestoppers 13 are not properly screwed in; they close tightly the openingsin the cover 4: about the stoppers 13; they insulate the stoppers fromthe cover.

Inside the cover 4 are the contact springs 29, 22 which are fixed by thescrews 19 and '21. From the screw 21 a conductor 26 leads directly tothe outgoing cable 5; from the screw 19 the current passes through afuse 23 to the screw 24 and fromthere to the conductor 25 and into thecable 5. A lamp attached to the other end of the cable 5, e. g. a headlamp can now be so secured that in case of damage a short circuit iscaused so that the fuse 23 melts and the conductors 25, 26 carry no morecurrent. When the accumulator is quite ready for use and properlyclosed, it is impossible either to damage an important part of it, or totouch any current carrying conductor, and it is also possible to testeasily whether a suflicient amount of electrolyte is present in thecells. without having to remove the cover 4.

What I claim is 1. An accumulator comprising a vessel, a

cover for the vessel, two-armed levers arranged thereon which levers arerotatable about fixed points on theaccumulator vessel anda pressurescrew which presses 0n the cover for pressing one arm of each of thelevers away from the cover, whereby the other press on the cover, andthe cover is pressed on simultaneously by the S IQW in the middle, sle

and by the levers at the 2. An accumulator as claimed in claim 1, havinga broad pressure piece which distributes the screw pressure over almostall the middle of the cover.

8. An accumulator as claimed in claim 1, in which the levers are soformed that they press on almost the whole width of the cover.

4:- An accumulator as claimed in claim 1, comprising a bridge memberhaving a screw threaded hole, and engaging with the nearer arms of thelevers and the pressure screw passing through the said screw threadedhole.

An accumulator as claimed in claim 1, having a bridge member whichengages with the lever arms in such a manner that the system comprisingthe two levers, thepressure screw and the bridge member forms a singleunit when detached from the cover. I

6. An accumulator as claimed in claim 1, in which the levers have V incombination with hook-like parts on the accumulator vessel which haveslots, in which slots thesaid pins are inserted.

In testimony whereof I have signed my name to this specification.

. PAUL WOLF;

pins attached thereto i

